OUR AMPHIBIOUS PERSICARIAS 27 
never either in the field or herbaria seen any terrestrial phase of 
an amphibious smartweed that was even a near approach in appear- 
ance to the distinctively narrow-leaved plant of Europe. I have in 
the field found some terrestrials with narrow leaves resembling 
those of P. amphibia and without the spreading herbaceous borders. 
but study of the spring and early summer terrestrials invariably 
showed the presence of these borders that later disappeared. 
I venture for this reason to predict that should the terrestrial 
phases of P. fluitans or P. canadensis be found some day they 
will have herbaceous borders to their ochreae! The reason 
for this suspicion, as I have just intimated, is obviously, because 
if the terrestrial phase actually exists, comparison with aquatic 
phases such as P. ammophila shows that terrestrials such as those 
of P. asclepiadea or P. ammophila itself are likely to be the forms. 
The latter has an aquatic phase that at times could hardly be 
distinguished from P. fluctans, but for the fact that it never 
blooms in the water phase. 
The most notable examples of P. amphibia which I have studied 
are the following mostly from the U.S. National Herbarium. 
No. 133941 U. S. Nat. Herb. Richter’s gathered at Pesth, 
Hungary. Aquatic. 
No. 257776 collected by the same is a riparian specimen. 
No. 387898 by G. de Chalmot, Kampen, Holland. The leaves 
are subcordate and lanceolate rather than the usual oblong- 
elliptic leaved specimens. 
No. 155279 collected by Mezambara (?) near Venice, also 
has subcordate leaves. 
Nos. 133947 and 155398 on the same sheet, the former the 
terrestrial, the latter subaquatic or riparian, both from the her- 
barium of G. C. Joad, July-Aug. 1866. ‘‘Flora Ingrica.’’ The 
terrestrial leaves subcordate 5-11.5 cm. long and 1-2 cm. wide, 
are scattered-strigose, some of the hairs gland-tipped, the leaves 
of the latter are 10-15 cm. long and 2.5—27 wide. 
No. 155398, Aug. 2, 1861. Specimen by Thorion. (Place and 
other data illegible). 
No. 45440, by S. E. Lassimone from France, Aug. 6, ’92. 
The terrestrial plant is not typically terrestrial but somewhat 
intermediate. Aquatic leaves 12x3. 5 cm. acute, subcordate. The 
terrestrial are much smaller 7x1.5 cm. 
